Bot Studio API 400 on Intent Entity Mapping

Just noticed that the POST /api/v2/ai/bots/{botId}/intents endpoint returns a 400 Bad Request when attempting to map custom entities to intents via our AppFoundry integration. The payload structure matches the schema documentation exactly, yet the response indicates a validation failure on the entity reference ID. This occurs consistently across multiple tenant environments using the latest Node.js SDK. Is there a known limitation regarding dynamic entity resolution in the current API version?